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I'm building my grandson a "spaceship" and I remember as a kid, my friends's "spaceship" and it had oscilloscopes. Looking for something that has the wavy lines and changes with knob turning.
I've had many from my first Heath Kit to tektronics. You can easily find a dual trace( two waveforms) scope for very little, especially if it's not calibrated. There are many used electronics dealer websites and of course Craig's list. I've actually thrown out two over the years that worked, modern technology made them antiquated and they weren't worth selling. They are priced low because there are so many of them. Beyond tubes and older analog circuitry, the older ones are too slow for the frequency of today's digital circuitry.

I will see if I have any sources from days of fixing electronic equipment and PM you. I used to restore tube radios, ham radio transceivers and repair calibrate and align equipment in the maritime, aviation and public service fixed radios including radar.
 
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